The amount of the F–20 that will remain after 44 s given the data from the question is 0.3125 g
Data obtained from the question Half-life (t½) = 11 sOriginal amount (N₀) = 5 gTime (t) = 44 sAmount remaining (N) = ?How to determine the number of half-lives Half-life (t½) = 11 sTime (t) = 44 sNumber of half-lives (n) =?
n = t / t½
n = 44 / 11
n = 4
How to determine the amount remaining Original amount (N₀) = 5 gNumber of half-lives (n) = 4Amount remaining (N) = ?N = N₀ / 2ⁿ
N = 5 / 2⁴
N = 5 / 16
N = 0.3125 g
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Name the following branched alkanes. Two of these are isomers of each other, put a star ★ in their boxes.
Answer:
Structure 1:
The longest chain is made up of 4 carbons (butane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylbutane.
Structure 2:
The longest chain is made up of 7 carbons (heptane). There is a 2-carbon branch (ethyl). The lowest possible position of the branch is on the 4th carbon. This makes the alkane: 4-ethylheptane.
Structure 3:
The longest chain is made up of 4 carbons (butane). There are 2, 1-carbon branches (dimethyl). The lowest possible position of both branches is on the 2nd carbon. This makes the alkane: 2,2-dimethylbutane.
Structure 4:
The longest chain is made up of 3 carbons (propane). There are 2, 1-carbon branches (dimethyl). The lowest possible position of both branches is on the 2nd carbon. This makes the alkane: 2,2-dimethylpropane.
Structure 5:
The longest chain is made up of 6 carbons (hexane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylhexane.
Structure 6:
The longest chain is made up of 3 carbons (propane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylpropane.
The isomers are structures 1 and 4 because they contain the same amount of carbons (5) and hydrogens (12) while assuming different structures.
Compact efficient cars usually get 38 miles per gallon of gasoline
Answer:
Compact cars with smaller engines can't achieve more than 30 mpg because of the weight difference
Hope This Helped
What changes in color occur when bromine reacts with an alkene?
How many grams of Copper are in 500grams of Cu2CO3?
Answer:
≈170.22 [gr].
Explanation:
1) M(Cu₂CO₃)=2*64+12+3*16=188 [gr/mol];
2) the part of copper in Cu₂CO₃ is:
[tex]\frac{64}{188} =\frac{16}{47};[/tex]
3) 16/47% of 500 [gr] is:
[tex]500*\frac{16}{47}=170.22[gr].[/tex]
What term describes the movement of small rock particles
away from their source?
O Weathering
O Decomposition
O Erosion
Answer:Erosion
Explanation:
I got it right on edmentum
What is the concentration expressed in parts per million of a solution containing 20.0 grams of C6H12O6 in 80.0 grams of H2O?
A) 2.50 × 10^5 ppm
B) 2.00 × 10^5 ppm
C) 4.00 × 10^6 ppm
D) 5.00 × 10^6 ppm
Answer:
B is the answer. 2.00 x 10^5 ppm
Explanation:
Right on edmentum
word equation for BaCl2(aq) + Na2Cr4(aq) → BaCrO4(s) + NaCl(aq)
Explanation:
Word Equation
Barium Chloride + Sodium Chromate = Sodium Chloride + Barium Chromate
1 mole of aqueous Barium Chloride [BaCl2] reacts with 1 mole of aqueous Sodium Chromate [Na2CrO4] to form 2 moles of aqueous Sodium Chloride [NaCl] and 1 mole of solid Barium Chromate [BaCrO4]
what are all the ways that you think knowing about the flow of energy might be useful in
thinking about the chemistry of Climate Change.
Yes the main benifit can be recyclation of energy
The example can be seen in powerbanks or invertersThe chemical energy present inside the battery can be used to convert itself into electric energy.Which can help us in climate protectionWhat is the IUPAC name of the compound N2O?
Answer:
Nitrous Oxide
Explanation:
I would really appreciate some help with this question:
Sulfur dioxide reacts with oxygen to produce sulfur trioxide:
2SO2(g) + O2(g) → 2SO3(g)
What mass of oxygen, in grams, would react completely with 1.28 g of sulfur dioxide?
Relative atomic masses (Ar): sulfur = 32, oxygen = 16
What is the engine piston displacement in liters of an engine who’s displacement is listed as 430 in.²
For an engine whose displacement is listed as 430 in.², the engine piston displacement in liters is mathematically given as
PD= 7.37 L
What is the engine piston displacement in liters of an engine whose displacement is listed as 430 in.²?
Generally, the equation for the dimensional analysis method,\, we convert in to L is mathematically given as
l*(v/l)*l/v
Therefore, piston displacement
PD=(450 in3) . (1 dm3 / 61.024 in3) . (1 L / 1 dm3)
PD= 7.37 L
In conclusion, piston displacement
PD= 7.37 L
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Oil spills are a very serious form of pollution. They severely affect marine biodiversity and coastal ecosystems. The table shows methods that can be used to control oil spills.
A scientist wants to design a solution to control an oil spill. This solution should decrease the impact of the oil spill on the local biodiversity of the ecosystem. The solution should also be quick and effective but have minimal negative effects on the environment. Which of the following solutions would be best for the scientist to choose?
A. allowing natural processes to occur without any human intervention
B. using mechanical methods to collect the oil in one part of the ecosystem
C. using chemical methods to break the oil into smaller droplets
D. using bioremediation to speed up existing, natural oil degradation
Hellpppp!
Answer:
D. using bioremediation to speed up existing, natural oil degradation.
Explanation:
Got an A on this.
Explanation:
The correct answer is option D
How much heat is released when 60.0 G of steam at 235°C is converted to water at 100°C?
Answer:12668 J.
Explanation:
First of all, steam is there so in order to convert it into water it must have to release latent heat of vaporization which is equal to approximately 2450 kJ/kg or 2450 J/g.
So, the calculation is given below.
Heat released during conversion of steam at 100°C to water at 100°C= m*L
= 5*2450= 12250 J.
Heat released during conversion of water at 100°C to water at 80°C= m*Cp*(∆T)
= 5*4.18*20= 418 J.
So total heat released= 12668 J.
hope this helps:)!!!
The heat energy released or absorbed by a system can be calculated using calorimetric equation. The heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33858 J or 338 KJ.
What is calorimetry?Calorimetry is an analytical tool used to determine the heat energy q absorbed or released in a reaction system. The calorimetric equation connecting mass of the reactant m, specific heat capacity c and temperature difference ΔT is related by the expression:
q = mcΔT.
The mass of steam is given 60 g and temperature difference is from 235 to 100 °C thus 135 °C and the specific heat capacity of water or steam is 4.18 J/°C. The heat energy released is calculated as follows:
q = 60 g × 4.18 J/°C × 135 °C
= 33858 J
Hence, heat is released when 60.0 g of steam at 235°C is converted to water at 100°C is 33585 J.
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Write the formula unit equation for this reaction occuring in water:
Calcium sulfide and iron(II) bromide are mixed to form iron(II) sulfide and calcium bromide.
1. CaS(aq) + FeBr(aq) →FeS(s) + CaBr(aq)
2. CaS(aq) + Fe2Br(aq) →Fe2S(s) + CaBr2(aq)
3. CaS(aq) + FeBr2(s) →FeS(s) + CaBr2(aq)
4. CaS(aq) + FeBr2(aq) →FeS(s) + CaBr2(s)
5. CaS(aq) + FeBr2(aq) →FeS(s) + CaBr2(aq)
6. CaS(s) + FeBr2(aq) →FeS(s) + CaBr2(s)
7. CaS(aq) + FeBr2(aq) →FeS(aq) + CaBr2(aq
The formula unit equation for the given reaction occurring in water is
CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq).
What is chemical reaction?
Chemical reactions are those reaction in which reactant molecules react with each other for the formation of product.
When calcium sulfide reacts with iron (II) bromide for the formation of iron(II) sulfide and calcium bromide will be represented through the following equation:
CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq)
Above reaction best explains the formula unit of given reaction as all valency of atoms are satisfied there.
Hence, the required formula unit is CaS(aq) + FeBr₂(s) → FeS(s) + CaBr₂(aq).
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The substance being dissolved
A) Solute
B) Solubility
C) Solvent
Answer:
A) Solute
Explanation:
In forming a solution, the substance which is dissolved by the action of the solvent is called solute.
On the basis of its name, what is the correct structural formula for pentene? CH2=CH−CH2−CH3 CH3−CH2−CH2−CH3 CH3−CH2−CH2−CH=CH2 CH3−CH2−CH2−CH2−CH3
The answer is CH₃-CH₂-CH₂-CH=CH₂ , Option C correctly represents the structural formula for pentene .
What is Alkene ?Any hydrocarbon containing one or more double bonds.
Alkenes are generally colorless non-polar compounds, somewhat similar to alkanes but more reactive.
The first few members of the series are gases or liquids at room temperature.
Pentenes are alkenes with the chemical formula C₅H₁₀.
Each contains one double bond within its molecular structure.
CH₃-CH₂-CH₂-CH=CH₂ , Option C correctly represents the structural formula for pentene .
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Use VSEPR theory to predict the molecular
shape of the ion NO−3.
1. trigonal-planar
2. bent or angular
3. tetrahedral
4. trigonal-bipyramidal
5. trigonal-pyramidal
6. octahedral
7. None of these
8. linear
Answer:
1. trigonal-planar
Explanation:
NO3- (nitrate) has three domains around it and each oxygen pushes against each other creating a planar structure.
Indicate whether solutions of the following salts would be acidic, basic, or pH-neutral.
a. NaNO3
b. Ba(C2H3O2)2
C. CH3NH3Cl
4. C6H5NH3CHO2
e. CoBr3
Answer is NH4NO3
YOU HAVE WRITTEN WRONG IN OPTION NO. A
EXPLANATION
Which of the following do sound waves generally travel most
quickly through?
Answer:
Sound waves travel faster through solids, because they can better transmit the soundwaves to your eardrum faster since they are closer together than air.
Answer:
Sound waves generally travel most quickly through gases.. Sounds can travel through air and water but not through solids. Sound waves travel hope this helps!
emitted helium nucleus
A sample of air is held in a 722 ml. container at 23.3°C. This sample is transferred into a 481 mL container
with a measured pressure of 2.055 atm and a stable temperature of 80.1. What was the initial pressure
in the first container (in atm)?
01.38
0.978
01.24
O 1.15
Apply combine gas law
T1=296.3KT2=353KSo
[tex]\\ \rm\Rrightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{P1(0.722)}{296.3}=\dfrac{0.481(2.055)}{353}[/tex]
[tex]\\ \rm\Rrightarrow 0.0024P1=0.0028[/tex]
[tex]\\ \rm\Rrightarrow P_1=1.167atm[/tex]
D
What type of reaction is the following?
H₂O ---> H₂ + O
[tex] \boxed{ \frak{Answer }}[/tex]
It's decomposition reaction.
[tex] \sf{Explanation}[/tex]
In decomposition reaction, a compound breaks into simpler form on heating.As, we can see in the above reaction, [tex] H_{2} O[/tex] is broken down into [tex] H_{2} [/tex] and [tex] O_{2} [/tex].
Hence it is a decomposition reaction.[tex] \boxed{ \frak{Be \: Brainly}}[/tex]
[tex] \boxed{ \frak{Keep \: Learning}}[/tex]
Chem help!! I know the answer is 8 but why?
Answer:
Explanation:
It's simple train track method of cancelling out units.
If we read the balanced equation as this: 2 dm3 of octane reacts to form 16 dm3 of CO2 then how much CO2 is produced by 1 dm3?
Would you agree that it would be half of 16?
[tex]\frac{2dm3}{16 CO2} = \frac{1dm3}{?CO2}[/tex]
Cross multiply and solve for ?, you get 8.
HELPPPPPP 30 POINTS Scientists are currently debating if a new epoch based on modern human activity should be added to the geologic timeline. What is the name of this epoch?
Question 27 options:
Anthropocene
Homo sapien
Holocene
Anthropology
Answer:
Anthropocene
Explanation:
Anthropocene epoch is sort of unofficial epoch that scientists have used to describe basically human made impact on geological scale.
here's more info:
https://www.earthsystems.com/the-anthropocene/
What element do all carbonate materials contain
Answer:
All carbonates contain one carbon atom bonded to three oxygen atoms. Carbonates may include other elements. A few are calcium, iron, and copper. Carbonate minerals are often found where seas once covered the land.
The pressure of a sample of 226 cm3 of methane is doubled. What is the new volume of the gas? Assume that the temperature stays constant
The new volume of the methane gas would be 113 atm
What is Boyle's law?At constant temperature, the pressure of a gas is inversely proportional to its volume.
Mathematically; P1V1 = P2V2 where P1 = initial pressure, P2 = final pressure, V1 = initial temperature, and V2 - final temperature.
In this case, V1 = 226 [tex]cm^3[/tex], P2 = 2P1
Thus: V2 = P1V1/2P1 = V1/2 = 226/2 = 113 atm
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When writing a net ionic equation the sum of the charges for reactants is greater than the sum of charges for products
Please select the best answer from the choices provided
OT
OF
Answer:
Explanation:
Net ionic equations must be balanced by both mass and charge. Balancing by mass means ensuring that there are equal masses of each element on the product and reactant sides. Balancing by charge means making sure that the overall charge is the same on both sides of the equation.
Which statement correctly describes 1 mole of iodine (I₂)
A) its mass is 126.9g
B) its mass is 380.7 g
C) it contains 6.02*10^23 atoms
D)it contains 6.02*10^23 molecules
Answer:
It contains 6.02*10^23 molecules
Explanation:
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how does fire relate to science
Answer: A fire itself is the result of a chemical reaction known as combustion, where fuel and oxygen react with one another and atoms rearrange themselves irreversibly. For this to occur, fuel must reach its ignition temperature, and combustion will continue if there is enough fuel, heat and oxygen
Which of the following describes how air resistance affects the motion of a falling object?(1 point) Air resistance may change the direction of a falling object but does not affect its speed. Air resistance may change the direction of a falling object but does not affect its speed. Air resistance opposes the force of gravity and causes falling objects to lose speed once they reach terminal velocity. Air resistance opposes the force of gravity and causes falling objects to lose speed once they reach terminal velocity. Air resistance opposes the force of gravity and causes an object to reach terminal velocity. Air resistance opposes the force of gravity and causes an object to reach terminal velocity. Air resistance works with gravity to pull a falling object towards the Earth. Air resistance works with gravity to pull a falling object towards the Earth.
Answer:
Air resistance opposes the gravity in a falling object hence the object loses speed once it reaches terminal velocity.
According to the experim
